How to make user text unique on ad site?

Question

Search Engine Optimization

Does it make sense to pursue the uniqueness of the text on the bulletin board, composed by ordinary users who can post the same text on different sites?
And if this makes sense, how to influence the uniqueness of the text?

Answer 1

It hardly makes sense, since all popular sites open only sections for indexing, but not the ads themselves.
With forums for low-frequency requests, it can ride, but why?